[OJFord]

If I bought a single ticket every single week, my cost is £52pa. I wouldn't miss it, fortunately, and I especially wouldn't miss the £7.70-£15.40 extra growth in my investments from putting it there instead as you advise. (And that's pretending that I can reliably get 15-30% every year.)

In exchange, I get extremely unlikely but extremely massive 'asymmetric upside'.

As I said, I don't do it, but sometimes I think actually it would be the rational thing to do. (What stops me is the thought: why stop at one ticket? how many tickets is the correct amount? clearly I don't know the appropriate way to model it (simply massive variance?) so I'll leave it alone. But it does bug me sometimes.)